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낮은 다분산성지수를 갖는 폴리에틸렌 왁스의 제조방법
A Method of Producing Polyethylene Wax Having a Low Polydispersity Index
한밭대학교 화학공학과, 대전 305-719
Department of Chemical Engineering, Hanbat National University, Daejeon 305-719, Korea
HWAHAK KONGHAK, December 2001, 39(6), 667-672(6), NONE
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Abstract
본 연구에서는 종래 기술의 문제점을 해결하기 위하여 낮은 다분산성지수를 갖는 폴리에틸렌 왁스를 생산하기 위한 새로운 열분해법을 개발하였다. 새로운 열분해법의 특징은 반응단계 이전에 예비가열단계를 갖는 것이다. 예비가열단계는 원료의 열전도도를 증가시키기 위하여 반응온도(380-400℃)보다 낮은 온도(250-370℃)로 원료를 가열하여 그 온도에서 일정한 시간동안 유지하는 것을 의미한다. 효과적인 열전달을 위하여 특수하게 설계된 임펠러가 내부에 설치되어 있는 외부순환형 루프반응기와 새로운 열분해법을 사용하여 다분산성지수(3.90이하)가 낮은 폴리에틸렌 왁스를 5.40시간이내에 생산할 수 있었다. 예비가열단계의 온도가 제품의 다분산성지수, 내용물의 점도, 제조시간에 미치는 영향은 무시할 만하였다. 예비가열단계의 수를 증가시켜도 제품의 다분산성지수는 거의 변하지 않았다. 반응온도가 증가하면 내용물의 점도는 시간이 증가할수록 보다 빨리 감소하며 그것으로 인하여 반응시간은 감소하였다. 내용물의 점도는 반응시간이 증가함에 따라서 감소하였다.
In this study, to solve the problems of previous techniques, a new thermal degradation method was used for producing polyetylene wax having a low polydispersity index. The thermal degradation method was characterized by putting the preheating stage before the reaction stage. At the preheating stage, to increase the thermal conductivity of raw material, the raw material was heated up to a certain temperature(250-370℃), which was lower than the reaction temperature(380-400℃), and was remained at that temperature for a certain time. Polyethylene wax with a low polydispersity index(less than 3.90) could be produced within 5.40 hr using both the thermal degradation method and an external-loop reactor in which specially designed impellers were installed for more effective heat transfer. The effect of the temperature of preheating stage on the polydispersity of product, the viscosity of medium and the manufacturing time was negligible. An increase in the number of preheating stage only marginally affected the polydispersity index of product. When the reaction temperature increased, the viscosity of medium was more rapidly decreased with time and, hence, the reaction time was decreased. The viscosity of medium was decreased with increasing the reaction time.
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